码头Ubuntu 12.04
码头Ubuntu 12.04
提问于 2014-05-21 17:53:20
当我从Docker索引下载一个全新的Ubuntu:12.04容器时，它中的任何内容都不起作用。它甚至没有sudo或lsb_release。有没有人知道为什么或如何将容器送到一个可用的状态？谢谢。
回答 1
Stack Overflow用户
发布于 2014-05-22 08:13:25
看看你做了什么，知道你期望什么，会很有趣的。但以下是一个有用的例子，也许这会有所帮助：
# get the image
docker pull ubuntu
# run pwd in the image and see that you are in "/"
docker run ubuntu pwd
/
# curl a website and see that curl is not installed
docker run ubuntu curl www.google.com
2014/05/22 07:52:42 exec: "curl": executable file not found in $PATH
# update apt-get
docker run ubuntu apt-get update
# Now attention: Docker will not change the base image Ubuntu!
# So apt is not updated in your Ubuntu image! Instead, Docker
# will create a new container every time you run a command. Let's see
# how the new container is called (your CONTAINER ID will be different!):
docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS
a7ae5dae6dd8 ubuntu:12.04 apt-get update 53 seconds ago Exited (0) 40 seconds ago nostalgic_lumiere
# So container a7ae5dae6dd8 is Ubuntu + apt-get update. Give it
# a name and save it as a new image:
docker commit a7ae my-ubuntu
# Now install curl in my-ubuntu
docker run my-ubuntu apt-get install -y curl
# And again: the image my-ubuntu is not changed! Instead we have a new
# container which has curl installed:
docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS
e07118069479 my-ubuntu:latest apt-get install -y c About a minute ago Exited (0) 45 seconds ago naughty_wozniak
a7ae5dae6dd8 ubuntu:12.04 apt-get update 9 minutes ago Exited (0) 9 minutes ago nostalgic_lumiere
# Let's save this container as our image:
docker commit e071 my-ubuntu
# and now run curl on my-ubuntu:
docker run my-ubuntu curl www.google.com
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 258 100 258 0 0 10698 0 --:--:-- --:--:-- --:--:-- 25800
<HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8">
<TITLE>302 Moved</TITLE></HEAD><BODY>
<H1>302 Moved</H1>
The document has moved
<A HREF="http://www.google.de/?gfe_rd=cr&ei=ZrB9U4_eH4HW_AbjvoG4Ag">here</A>.
</BODY></HTML>我希望这能帮助我们了解码头的工作原理。要使映像进入使用状态(安装软件包和其他东西)，您当然不会像上面那样手工操作。相反，您可以创建一个Dockerfile来构建一个映像：
FROM Ubuntu
RUN apt-get update
RUN apt-get install -y curl并构建您想要的图像，如docker build . -t my-ubuntu。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/23790496
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